package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignSerivce;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskService wareOrderTaskService;

    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    OrderFeignSerivce orderFeignSerivce;


    private void unlockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//变为已解锁
        wareOrderTaskDetailService.updateById(entity);
    }

    /**
     * skuId: 1
     * wareId: 1
     *
     * @param params
     * @return
     */
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wareSkuEntityQueryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            wareSkuEntityQueryWrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(skuId)) {
            wareSkuEntityQueryWrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params), wareSkuEntityQueryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1.判断如果还没有这个库存记录新增操作，有则修改操作
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities == null || wareSkuEntities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStockLocked(0);
            //TODO：远程查询sku的名字
            try {
                R info = productFeignService.info(skuId);
                Map<String, Object> skuInfo = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) skuInfo.get("skuName"));
                }
            } catch (Exception e) {//远程调用失败不作处理，事务无需回滚
            }
            wareSkuDao.insert(wareSkuEntity);
        }
        wareSkuDao.addStock(skuId, wareId, skuNum);
    }

    /**
     * 检查商品库存
     *
     * @param skuIds
     * @return
     */
    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count = this.baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());

        return collect;
    }

    /**
     * 为某个订单锁定库存
     * 默认只要是运行时异常就会回滚
     *
     * @param vo
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        taskEntity.setTaskStatus(1);
        wareOrderTaskService.save(taskEntity);
        //1.按照下单的收货地址，找到一个就近仓库
        //2.找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock skuWareHasStock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            skuWareHasStock.setSkuId(skuId);
            skuWareHasStock.setNum(item.getCount());
            //查询这个商品在哪个仓库有货
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuIdStock(skuId);
            skuWareHasStock.setWareId(wareIds);
            return skuWareHasStock;
        }).collect(Collectors.toList());
        //锁定库存
        for (SkuWareHasStock skuWareHasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = skuWareHasStock.getSkuId();
            //仓库id
            List<Long> wareIds = skuWareHasStock.getWareId();
            if (wareIds == null && wareIds.size() <= 0) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1.每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给mq
            //2.锁定失败，前面保存的工作单信息就回滚了。发送出去了的消息，即使要解锁记录，去数据库查不到id所以就不用解锁
            //
            for (Long wareId : wareIds) {
                //成功返回1，否则返回0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, skuWareHasStock.getNum());
                if (count == 1) {
                    //当前仓库锁定成功
                    skuStocked = true;
                    //TODO:库存锁定成功告诉MQ
                    WareOrderTaskDetailEntity wareOrderTaskDetailEntity = new WareOrderTaskDetailEntity(null, skuId, "", skuWareHasStock.getNum(), taskEntity.getId(), wareId, 1);
                    wareOrderTaskDetailService.save(wareOrderTaskDetailEntity);
                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(taskEntity.getId());
                    //
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(wareOrderTaskDetailEntity, stockDetailTo);
                    //不能只传id,防止回滚，通过id查数据库没有数据了，传全部的数据到mq中
                    stockLockedTo.setStockDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);
                    break;
                } else {
                    skuStocked = false;
                    //当前仓库锁定失败,重新下一个仓库
                }
            }
            if (skuStocked == false) {
                //当前商品所有仓库都没锁住
                throw new NoStockException(skuId);
            }
        }
        //全部都是锁定成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo stockDetailTo = to.getStockDetailTo();
        Long detailToId = stockDetailTo.getId();
        //解锁
        //1.查询数据库关于这个订单的库存信息
        WareOrderTaskDetailEntity entity = wareOrderTaskDetailService.getById(detailToId);
        if (entity != null) {
            //有：证明库存锁定成功
            /**解锁：订单情况
             *  1.没有这个订单(库存锁定成功，没有生成订单)，必须解锁
             *  2.有这个订单，订单状态 已取消，解锁
             */
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();
            //根据订单号查询
            R r = orderFeignSerivce.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                //订单返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if ((data == null || data.getStatus() == 4) && taskEntity.getTaskStatus() == 1) {
                    //订单被取消，解锁
                    //当前库存工作单已锁定，未解锁
                    unlockStock(stockDetailTo.getSkuId(), stockDetailTo.getWareId(), stockDetailTo.getSkuNum(), detailToId);
                }
            } else {
                //消息拒绝以后重新放到队列里面 orderFeignSerivce.getOrderStatus(orderSn); 失败
                throw new RuntimeException("远程服务调用失败");
            }
        } else {
            //无需解锁
        }
        //无：库存锁定失败了，库存回滚，无需解锁
    }

    /**
     * 防止出现订单过了半个小时还未手动或自动取消，库存就解锁了
     *
     * @param to
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo to) {
        String orderSn = to.getOrderSn();
        //查一下最新的库存解锁状态
        WareOrderTaskEntity entity = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = entity.getId();
        //按照工作单找到所有，没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> list = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity1 : list) {
            unlockStock(entity1.getSkuId(), entity1.getWareId(), entity1.getSkuNum(), entity1.getId());
        }
    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private List<Long> wareId;
        private Integer num;
    }
}